In the early 18th century peter the great conquer the swedish coastal territory because he wanted to

This was due to regaining and expending his lost territory

It was the August 1700, when Peter decided about the war with Sweden. Before this war, he was also in the tangled with Ottoman empires to conquer the southern states of Turkey. By following Lee's opinion, as for getting the immediate prestigious image of Russia among other states,  the Peter arranged his army to declare war with Swedish Coastal. According to their remarks, It was more easy to explore and conquer their lost territory from the Swedish the Ottoman Empires